The console mainly acts as the interface to the script interpreter. You can enter expressions and one-line commands. When you enter an expression, both the expression and its result will be logged on the console. You can therefore use this as a calculator ("what is 17*4?"), and to check PCC2 expressions (Distance(Ship(10), Ufo(20)), Ship(17).Name) or commands (SetMission 4). The command repertoire is similar to PCC2. For details, refer to PCC2 Interpreter Documentation.

Reference

Keys:
AltC from almost everywhere
This is a testing version.
It may be incomplete, and have more bugs (or features) than the public live version at planetscentral.com.